Using your plugin in combination with Networks for WordPress, I notice that when saving settings on the ESA options page will divert me to the same page but on another network. It seems to always switch to the network that has been created last, unless when saving the options on that network in which case it switches to the second from last created network. The settings get saved just fine none the less.

I do not know if only showing the options page on the root network will prevent this redirection.

Initially, I had the plugin not activated on all networks among which that last created network. But still it would redirect to that last network which resulted in a 'you are not allowed to be here' page...